[kedarjan]

I am doing air compressor analysis

I modeled a surface model of air compressor in ICEM CFD and doing unstructured meshing tetra+hexa mixed in ICEM CFD.
when I take the .msh file to fluent following BC I am giving

inlet BC- mass flow inlet (0.5 kg/s)
outlet BC - pressure outlet (back pressure 3.5bar)
compressor walls - wall BC with ambient temp
the mesh is very complex as the screw inside the air compressor makes it complex and there are much more elements in my mesh
When I run the solution with laminar model and energy eq ON
it runs for few iterations
I get reversed flow in pressure outlet
also I get temperature limited to 1.0000e1 warnings during iteratins

later it diverges because of the temperature

Kindly anybody can help me to get solution

would under relaxation factor help in this regard?
Thanks